OLR (1981) 28 (12) C. Chemical Oceanography, 865

of some isotopes are explained via scavenging from the water column and rapid remobilization of deposited sediments. Geol. Dept., Univ. of South Carolina, Columbia, S.C. 29208, USA. (mjj)

81:6510 Noshkin, V.E., J.L. Brunk, T.A. Jokela and K.M.

Wong, 1981. zaaPu concentrations in the marine environment at San Clemente Island. Hlth Phys., 40(5):643-659.

U.S. Navy-sponsored underwater tests designed to evaluate the effects of exposure to seawater on several forms of nuclear fuels were the source of the 238Pu contamination of the benthic environment around San Clemente. Concentrations of Pu and other radionuclides in surface sediments, seawater and brown algae (Macrocystispyrifera) are discussed. The area of contamination is evaluated; estimates are made of the amount of radionuclides that migrated outside the immediate region. Lawrence Livermore Lab., Univ. of Calif., Livermore, Calif. 94550, USA. (bwt)

81:6511 Salo, Anneli and Aarno Voipio, 1981. Balance of

Sr-90 and Cs-137 in the Baltic Sea revised 1978, Mar. Pollut. Bull., 12(6):218-224.

Total Cs-137 reached a maximum in 1966 and St-90 in 1967. If fresh fallout has been insignificant since, then effective half-life for Cs-137 is ~ 9 years; for St-90, ~ 1 5 years. Inst. for Radiation Protection, P.O. Box 268, SF00101, Helsinki 10, Finland. (mwf)

C120. Dissolved gases

81:6512 Fonselius, S., 1981. Oxygen and hydrogen sulphide

conditions in the Baltic Sea. Mar. Pollut. Bull., 12(6):187-194. Inst. of Hydrographic Res., Na- tional Board of Fish., Box 2566, S-403 17 Goteborg, Sweden.

C140. Nutrients

81:6513 Gundersen, K., 1981. The distribution and biological

transformations of nitrogen in the Baltic Sea. Mar. Pollut. Bull., 12(6):199-205.

Data from the last 10-15 years suggest that, despite massive blue-green algae blooms, biological pro- cesses in the N-cycle seem healthy and in balance. Blue-green fixed-N may be mineralized and nitrified

while a comparable amount of nitrate is denitrified in deep water and lost. Dept. of Mar. Microbiology, Gothenburg Univ., Carl Skottsbergs Gata 22, S-413 19 Gothenburg, Sweden. (mwf)

81:6514 Nehring, D., 1981. Phosphorus in the Baltic Sea.

Mar. Pollut. Bull., 12(6): 194-198. Acad. of Sci. of the GDR, Inst. of Mar. Res., Rostock, DRG.

C150. Particulate matter

81:6515 Iseki, K., 1981. Particulate organic matter transport

to the deep sea by salp fecal pellets. Mar. Ecol.-Prog. Ser., 5(I):55-60.

Free-floating sediment traps in the northern North Pacific collected a considerable amount of large, dark-green particles, ~ 1 mm in diameter, which corresponded morphologically with salp fecal pellets. Verti~=al carbon flux was estimated to be 10.5 and 6.7 mg C m-2d ~ at 200 and 900 m, respectively, suggesting that vertical transport of salp fecal pellets plays an important role in meeting the energy requirements of open ocean bathypelagic organisms. Seakem Oceanography Ltd., 9817 West Saanich Rd., Sidney, BC VSL 3S1, Canada.

C180. Geochemistry, biogeochemistry (see also D-SUBMARINE GEOLOGY AND GE- OPHYSICS)

81:6516 Devol, A.H. and S.I. Ahmed, 1981. Are high rates of

sulphate reduction associated with anaerobic oxidation of methane? Nature, Lond., 291(5814): 407-408.

Rates of SO4 reduction in the anoxic sediments of Saanich Inlet (Vancouver, Canada) peak at the depth zone where SO 4 concentrations approach zero, i.e., where anaerobic methane oxidation should be occurring in accordance with recent hypotheses. Fisheries Res. Inst., Univ. of Wash., Seattle, Wash. 98195, USA. (mjj)

81:6517 Elderfield, H., N. Luedtke, R.J. McCaffrey and M.

Bender, 1981. Benthic flux studies in Narra- gansett Bay. Am. J. Sci., 281(6):768-787.

Chemical influx is promoted by the contrast between overlying water and interstitial water chemistries